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Supports: MPG, MPEG
The .mpg / .mpeg extension is an MPEG program stream — usually MPEG-1 (standardized in 1992) or MPEG-2 video with the audio track encoded as MPEG-1 Audio Layer II (MP2) or Layer III (MP3). Extracting the audio to WAV gives you uncompressed linear PCM, the standard input for every professional audio editor on Mac, Windows, and Linux. Common reasons to convert MPEG → WAV:
| Property | MPEG Audio (MP2 / MP3 in .mpg) | WAV (PCM) |
|---|---|---|
| Standard | ISO/IEC 11172-3 (MPEG-1), 1992 | Microsoft/IBM RIFF, 1991 |
| Compression | Lossy psychoacoustic | None — raw linear PCM |
| Typical bitrate | 128-384 kbps (MP2), 64-320 kbps (MP3) | 1411 kbps (16-bit/44.1k stereo), 2304 kbps (24-bit/48k stereo) |
| Sample rates | 32, 44.1, 48 kHz (MPEG-1); also 16 / 22.05 / 24 kHz (MPEG-2) | 1 Hz to 4.3 GHz (commonly 44.1, 48, 96 kHz) |
| Bit depth | N/A (encoded coefficients) | 8, 16, 24, 32-bit float |
| File size (1 min stereo) | ~1.5-2.5 MB (192 kbps MP2) | ~10 MB (16-bit/44.1k), ~17 MB (24-bit/48k) |
| Best for | Broadcast distribution, DVD-Video | Editing, mastering, transcription, archival |
| Max file size | Limited by container | ~4 GiB (32-bit size field) — use RF64/W64 for longer |
| Sample rate | Bit depth | 1 min stereo size | Use case |
|---|---|---|---|
| 16 kHz | 16-bit | ~3.7 MB mono | Speech recognition (Whisper, Google STT) |
| 22.05 kHz | 16-bit | ~5 MB | Voice memos, dictation |
| 44.1 kHz | 16-bit | ~10 MB | CD audio, music mastering |
| 48 kHz | 16-bit | ~11 MB | Broadcast, video deliverables |
| 48 kHz | 24-bit | ~17 MB | Pro audio post-production |
| 96 kHz | 24-bit | ~33 MB | High-resolution mastering, archival |
Match the source rate when you can. MPEG-1 video audio is almost always 44.1 or 48 kHz, so picking "Original" sidesteps any resampling-quality concerns.
For MPEG-1 program streams (the most common .mpg / .mpeg files), the audio is MPEG-1 Audio Layer I, Layer II (MP2), or Layer III (MP3). Layer II is by far the most widespread for video, especially anything sourced from PAL DVDs, European broadcast, or Digital Audio Broadcasting (DAB). MPEG-2 program streams may carry MP2 or AC-3 audio. The conversion decodes whichever codec is present and re-encodes to uncompressed PCM in a RIFF/WAVE container.
No — the WAV is a faithful decode of what's already in the MPEG. If the source is 192 kbps MP2, the audio quality is locked at "192 kbps MP2 quality" forever; wrapping it in PCM doesn't add fidelity that the encoder discarded. WAV is the right format for editing without further loss, not for upgrading low-bitrate sources. Think of it as moving the audio into a workspace, not improving it.
A typical MPEG video clip stores audio at 128-256 kbps; PCM in WAV at 16-bit / 44.1 kHz stereo is 1411 kbps. That's a 6-10× expansion of just the audio data, before you factor in that the WAV no longer carries the video. Expect roughly 10 MB per minute for CD-quality stereo WAV. If size is a problem, encode to FLAC (lossless, ~50% smaller) or pick a higher-quality MP3 for distribution.
Match the source whenever possible — that's what "Original" does. If you must pick: 48 kHz for anything tied to video, broadcast, or post-production; 44.1 kHz for music distribution and CD masters; 16 kHz mono for speech recognition pipelines (which downsample anyway). Picking a higher rate than the source doesn't gain quality — it just makes the file bigger.
Keep stereo if the source has true stereo content (music, ambient recordings, stereo dialogue). Force mono only when the source is dual-mono (the same signal on both channels — common for old camcorders and broadcast voiceover), or when your downstream tool expects mono (most speech-recognition APIs). Mono is half the file size of stereo at the same rate and depth.
Yes — use the Trim controls to set a Start (when audio begins) and Duration (how long to extract), both in seconds or HH:MM:SS.sss format. Useful for pulling a specific scene's dialogue, a music cue, or a single sound effect out of a long recording without re-editing the full file. For more elaborate cuts use the dedicated audio cutter.
WAV's metadata support is minimal compared to MP3's ID3 tags — the RIFF format has a basic INFO chunk that holds title, artist, year, and comment fields, and Broadcast WAV (BWF) adds more. Most MPEG video files don't carry rich audio metadata in the first place; any container-level tags you have may not survive the demux. If you need to keep metadata, re-tag in your DAW or use a tool like Mp3tag after export.
Standard WAV uses a 32-bit unsigned integer for the file-size field, so the practical limit is just under 4 GiB — about 6.8 hours of 16-bit / 44.1 kHz stereo. If you're extracting audio from a longer source, either split into multiple WAVs, drop to mono, or use RF64/W64 in a desktop editor. For most one-hour-or-less MPEG clips this never matters.
Both are lossless. WAV has wider tool support (every editor and broadcast deck accepts it) and zero decode overhead, but limited metadata and the 4 GiB cap. FLAC is roughly 40-60% smaller, has rich metadata via Vorbis comments, and is the better archival choice when storage matters. Convert to WAV for editing, then bounce to FLAC for archival if disk space is tight — or jump straight to MPEG to FLAC.
If your goal is editing or transcription, WAV is the right output — every DAW and STT engine prefers PCM. If your goal is listening or sharing, MPEG to MP3 gives you a much smaller file that plays on every device. WAV is the editing intermediate; MP3 is the distribution format. Many workflows do both: WAV for the master, MP3 for delivery.